Not fiat, but expect many other "currencies" here on nostr soon. First up will probably be #xmr, as they're building a client (Topaz) and wallet connect for Cake Wallet (which supposedly integrated lightning recently).

nostr:npub16jh9ua9he3k0c0usx5kcn9kyg2prdcd3ds4f903cf4wfmmfkp7eqhyw5l3

nostr:nevent1qqs93f65rdmnfmzxssl2qctjfls2r3yhgj0a4d7heaksdnxkgdfp32cwlj4a0